999 giveaway, and here it is the 1000th! [GA inside] ---ENDED---

Yay, I made 999 giveaway, and here it is the 1000th!
Ok, a little tiny puzzle still there, but it's easy, I promise!
...and until you solve that, please look at our two cats!
Ohh, yes, two!
Similar as my old puzzle you can see again Cicukapitany, our big and wayward grey tom-cat, and you can see first time Dundi, our black-red adopted female street cat!

and what's the LVL 5+ non-bundled game? THIS!

First hint: 4 letters are visible, the last one is hidden somewhere

ENDED

The first four letters are the bold letters in the description and you can find the last letter on the top left corner of the Cicukapitany's picture in the blue area and this was the letters: gObuN

The main giveaway was the "Mortal Kombat X" and this is the link , and there was a second secret "One Piece Pirate Warriors 3" giveaway, when you clicked the BUMP link in the MKX giveaway.

View attached image.

View attached image.